Syringe



A. QUINCHE ETAL SYRINGE Filed Jan, 21. 1954 Nov. 10, 1959 myZ-nr,

United States Patent() SYRINGE Albert Quinclle, Saint-Sulpice, and Edouard Lecluyse, Vevey, Switzerland, assignors, by mesne assignments, to American Can Company, New York, N.Y., a corporation of New Jersey Application January 21, 195-4, Serial No. 405,468

9 Claims. (Cl. 12S-216) Several types of syringes lending themselves to a single use are already known, such syringes including a distortable reservoir for the liquid to be injected to which a hypodermic needle is secured. Said needle, when in inoperative position, does not contact the liquid to be injected. Each syringe belonging to these known types also comprises a perforating member slidably received inside the hypodermic syringe for being capable of piercing a closure wall provided inside the liquid container.

When a syringe of this type is used, the perforating member is withdrawn from the hypodermic needle after having perforated the closure wall, whereupon the needle may be inserted into the patients body. The perforating member is merely housed inside the needle and therefore runs the risk of easily falling off and thus becoming lost. It also involves the serious disadvantage that extraneous and non-sterile bodies may be introduced into the reservoir containing the liquid to be injected.

Moreover the perforation of a metal or plastic wall cannot be conveniently performed by merely pressing or withdrawing the perforating member because a hole made in this way will often close back almost entirely and will not allow the liquid to be injected to pass through it.

An object of the invention is to provide a new or irnproved hypodermic syringe obviating the aforesaid disadvantages while lending itself to an easy manufacture.

Another and more specific object of the invention is to provide an improved hypodermic syringe as aforesaid comprising a distortable reservoir or container for the liquid to be injected with this particular feature that one end of said container is formed as a bored spigot into which is rmly tucked and held one end of a hypodermic needle, the latter being fitted with a stopper rod ensuring sealing of the container, said spigot being provided with a removable cap adapted to shroud and protect the needle and the stopper rod.

With these and such other objects in view as will incidentally appear hereafter, the invention comprises the novel construction and combination of parts that will be now described with reference to the accompanying diagrammatic drawing exemplifying the same and forming a part of the present disclosure.

The drawing shows the relevant portions of a hypodermic syringe according to an embodiment of the i11- vention.

Figure 1 is an axial sectional View of the syringe.

Figure 2 is an elevational View of this syringe.

As shown, the hypodermic syringe comprises a pliable or distortable container or reservoir 1 made of a suitable moldable thermoplastic material and adapted to contain the liquid to be injected. This container 1 is formed at one end with a bored spigot 2 into which is iirmly tucked and held one end of a hypodermic needle 3. Inside this needle is housed a stopper rod 4 provided at one end with a knurled head 5. The other end 6 of the rod 4 is engaged through the spigot 2 and performs perfect sealing of the container 1.

2,911,971 Patented Nov. 10, 1959 ICC The spigot 2 is provided on its peripheral surface with a screw-thread 7 upon which is removably secured a cap 8 adapted to shroud and protect the hypodermic needle 3 andthe stopper rod 4.

The operation of the hypodermic syringe as shown is as follows:

After the cap S has been unscrewed from 7 and taken off, the stopper rod 4 is withdrawn by grasping its knurled headV 5, thereby providing inside the spigot 2 and the needle 3 a channel of sucient size for driving and instilling into the patients body the liquid which is contained in the reservoir 1.

According to a preferred constructional modification which can be readily understood without requiring a special illustration, the stopper rod 4 has a slight frustoconical shape and is advantageously made of a stainless metal or alloy.

When manufacturing the hypodermic syringe as above described by using a plastic material, care must be taken to position the needle 3 and the rod 4 before molding the spigot 2 to proper shape, whereby when the plastic material cools and sets after molding, it tightly encompasses and clamps the needle 3 and the rod 4 while perfectly sealing the reservoir 1 to prevent any leakage. If desired, of course, the needle 3 at the part which will be in molded contact with the spigot may have formed thereon a rou'ghened or other irregular surface to insure a rm grip by the plastic.

Minor constructional details may be varied without departing from the scope of the subjoined claims.

What is claimed is:

1. In a hypodermic syringe of the type including a distortable reservoir for a liquid to be injected, a molded thermoplastic spigot arranged adjacent one end of the reservoir and having a bore communicating with the inside of the reservoir, a hollow hypodermic needle having one end penetrating into the spigot bore for being held therein, a portion of reduced diameter in said bore between the end of the needle and the inside of the reservoir, a stopper rod removably held in the hypodermic needle and extending into the inside of the reservoir, said spigot being molded against said stopper rod whereby the latter is tightly gripped with anherrnetic sealing action and firmly retained in place by the said reduced diameter portion of the spigot bore.

2. In a hypodermic syringe of the type including a distortable liquid reservoir, a molded thermoplastic spigot arranged adjacent one end of the reservoir and having a ybore communicating with the inside of the reservoir, a hollow hypodermic needle held by one of its ends in the spigot bore, the channel in the needle communicating with the inside of the reservoir, a portion of reduced diameter in said bore between the end of the needle and the inside of the reservoir, a stopper rod removably engaged in the inner channel of the needle and extending into the reservoir, said spigot being molded against said stopper rod whereby the latter is tightly gripped with an hermetic sealing action and firmly retained in place by the said reduced diameter portion of the spigot bore, and a knurled head on the outer end of the stopper rod.

3. A hypodermic syringe as claimed in claim l wherein said liquid reservoir and spigot are of polyethylene.

4. A method for producing a hypodermic syringe comprising positioning in a mold cavity a hypodermic needle fitted with a stopper rod, and molding a hollow plastic reservoir thereon, said plastic reservoir surrounding and tightly gripping the said needle and rod assembly.

5. A method as claimed in claim 4 wherein one end of the said plastic reservoir is formed as a spigot and surrounds the needle and rod assembly tightly gripping the same.

6. A method as claimed in claim 4 including providing l0 References Cited in the le of this patent UNITED STATES PATENTS Greely Mar. 26, 1912 Kraft Dec. 9, 1924 Bronson Feb. 4, 1941 15 4 Lingenfelter Oct. 28, 1952 Butler Ian. 12, 1954 Smith Jan. 26, 1954 Fox Apr. 27, 1954 Ogle Nov. 9, 1954 Walter Feb. 15, 1955 FOREIGN PATENTS Great Britain 1915 France Apr. 18, 1916 Great Britain Nov. 23, 1916 France Jan. 9, 1917 Great Britain July 13, 1922 Germany July 13, 1953 France Jan. 27, 1954 

